CN102767821B - Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure - Google Patents
Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure Download PDFInfo
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- CN102767821B CN102767821B CN201210216449.2A CN201210216449A CN102767821B CN 102767821 B CN102767821 B CN 102767821B CN 201210216449 A CN201210216449 A CN 201210216449A CN 102767821 B CN102767821 B CN 102767821B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 37
- 239000000779 smoke Substances 0.000 title claims abstract description 19
- 239000002918 waste heat Substances 0.000 title claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 43
- 239000003546 flue gas Substances 0.000 claims description 43
- 238000000605 extraction Methods 0.000 claims description 36
- 230000001172 regenerating effect Effects 0.000 claims description 30
- 239000003517 fume Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 4
- 230000007717 exclusion Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 3
- 238000009998 heat setting Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 6
- 230000000750 progressive effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a smoke waste heat deep utilization system of a coal-fired power station boiler for heating supplied water at a high pressure, belonging to the field of energy-saving equipment using waste heat. According to the smoke waste heat deep utilization system, smoke with a temperature about 300-400 DEG C at the tail of the boiler respectively enters a high-temperature rotary type air pre-heater (2), a smoke condensed water heater (3) and a low-temperature rotary type air pre-heater (4), enters a prepositioned air pre-heater (6) after passing through a dust collector (5), and is discharged out of the system until the smoke is cooled to a temperature about 60-100 DEG C; and supplied water at the high pressure in a back-heating system is heated by using the high-temperature smoke, so that a higher energy-saving effect can be obtained. Meanwhile, the water at an inlet of the smoke feed water heater (3) can be flexibly adjusted through a pipeline design, so as to be extracted from inlets of different high-pressure heat regenerators. Therefore, when the entire smoke waste heat utilization system at the tail of the power station boiler is in various working conditions, an air side and a water feeding side are at an optimal operation working condition.
Description
Technical field
The invention belongs to the economize energy apparatus field utilizing waste heat, particularly a kind of flue gas in power station boiler waste heat deep exploitation system for heating high-pressure feedwater.Be utilize air preheater progressive solution air and flue gas feed-water heater to heat main feedwater to complete the deep exploitation of fume afterheat specifically, reduce unit coal consumption.
Technical background
In China, coal-burning power plant consumes the coal production of the nearly half in the whole nation, along with rising steadily of Coal Energy Source price in recent years, cost of electricity-generating based on coal increases day by day, each thermal power plant is faced with huge economizer pressure, constantly seek the new technology reducing coal consumption, the application of economize energy aspect, and strengthen relevant fund input.
For the consideration avoiding back-end surfaces acid dew piont corrosion, in thermal power plant, exhaust gas temperature is generally at about 120 ~ 130 DEG C; Use the boiler of high-sulfur combustor, exhaust gas temperature brings up to about 150 DEG C; Install the boiler of steam air heater additional, exhaust gas temperature can reach 150 ~ 180 DEG C, and the exhaust gas temperature of individual boilers is more up to more than 180 DEG C.Exhaust gas temperature is too high directly causes appreciable energy in flue gas just direct discharged to air without utilization.In environment protection desulphurization requirement, in the smoke limestone wet desulfurizing process that current most of thermal power plant adopts, best desulfurization temperature is about 50 DEG C, in desulfurizing tower, exhaust gas temperature is reduced to about 50 DEG C by spray mode, not only consume a large amount of water and the energy, and too increase smoke discharge amount.Therefore, from the viewpoint of energy-saving and emission-reduction and economy two, reduce the inevitable choice that exhaust gas temperature becomes current station boiler development energy-conserving and emission-cutting technology further.
The prospect of residual-heat utilization technology application is extensive.Abroad, afterbody exhaust gas temperature is reduced and the equipment being reclaimed heat obtains application more for a long time.To in the ultra supercritical unit grown up in the near future, Cologne, Germany Nideraussem 1000MW level brown coal generating set is installed at waste heat exchange device in the bypass flue of air preheater, separation flue system is adopted fully to reduce exhaust gas temperature, simultaneously heating boiler feed water in introducing portion flue gas to bypass flue.Germany Schwarze Pumpe power plant 2 × 800MW brown coal generating set has installed gas cooler additional after electrostatic precipitator, utilizes fume afterheat to carry out heating boiler feed water.In China, Waigaoqiao of Shaihai power plant, in three phases enlarging million kilowatt extra-supercritical unit engineering project, is just applied to afterheat heat exchanger ending portion fume afterheat back and forth.
What be applicable to boiler tail flue gas UTILIZATION OF VESIDUAL HEAT IN at present is all direct consideration air preheater exit low-temperature flue gas heat-setting water, and because air preheater exhaust gas temperature is about 120-140 DEG C, its temperature utilizes limited space, and form is single.Do not consider the Energy harvesting relation between flue gas, air, condensate water three from system perspective, in the present invention, flue gas, air and feedwater form level Four heating system, consider two-stage regular air preheater progressive solution air, between the conventional air preheater of two-stage, arrange that flue gas is to water-to-water heat exchanger, with the feedwater of the flue gas high-pressure extraction system of higher temperature.And consider that flue gas low-temperature corrodes, corrosion-resistant forward type air preheater is installed after conventional cryogenic air preheater, can considers to use heat pipe-type air preheater.System take into account under different load, the flexible connected mode of flue gas heat-exchange unit and bleeder heater, guarantees that whole Rear of Utility Boiler smoke waste heat utilization system is all in best waste heat recovery state under various working, in air side and condensate water side.
Summary of the invention
The object of the invention is the smoke discharging residual heat deep exploitation for fired power generating unit and propose a kind of flue gas in power station boiler waste heat deep exploitation system for heating high-pressure feedwater, it is characterized in that, this system is made up of three grades of flue gas air heating systems and flue gas feed-water heater; The smoke discharging pipe of boiler 1 is in series with high temperature rotating regenerative air heater 2, flue gas feed-water heater 3, low temperature rotary air preheater 4, deduster 5, forward type air preheater 6 successively, and air-introduced machine 7; Steam turbine high-pressure cylinder 8, Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 and generator 11 are connected in series, and the regenerative steam of described steam turbine high-pressure cylinder 8 and Steam Turbine Through IP Admission 9 heats the feedwater in the high-pressure extraction system be made up of 1# high-pressure extraction heater, 2# high-pressure extraction heater and 3# high-pressure extraction heater; The feedwater of this heating returns steam turbine high-pressure cylinder 8 through 1# high-pressure heater again; The regenerative steam of described turbine low pressure cylinder 10 and steam discharge enter condenser and condensate water low-pressure heating system 12, the condensate water in heat-setting water low-pressure heating system 12; By condensate water low-pressure heating system 12, condensate water is delivered to oxygen-eliminating device and feed pump 13, feed water through oxygen-eliminating device and feed pump 13 and deliver to 3# high-pressure extraction heater, 2# high-pressure extraction heater, 1# high-pressure extraction heater successively.2# high-pressure heater or 3# high-pressure heater are connected in series by valve and flue gas feed-water heater 3.
Described flue gas feed-water heater 3 not only can be arranged in parallel with 2# high-pressure extraction heater by the combination of corresponding pipeline and valve, but also be arranged in parallel with 3# high-pressure extraction heater; And by the combination of booster pump 14 and corresponding pipeline/valve, then not only can be connected between 2#-3# high-pressure heater, but also can be connected between 3# high-pressure heater-oxygen-eliminating device
The fume afterheat deep exploitation method of the described flue gas in power station boiler waste heat deep exploitation system for heating high-pressure feedwater, it is characterized in that, in fume side, the flue gas of 300-400 DEG C of boiler 1 afterbody is through high temperature rotating regenerative air heater 2, enter flue gas feed-water heater 3, enter low temperature rotary air preheater 4 again, then pass in and out forward type air preheater 6 through deduster 5, its smoke evacuation enters desulfurizer through air-introduced machine 7, the forward type air preheater 6 arranged and low temperature rotary air preheater 4 make high temperature rotating regenerative air heater 2 entering air temperature raise, exhaust gas temperature also increases, high temperature rotating regenerative air heater 2 exhaust gas temperature controls between 220-280 DEG C, guarantee that its heat can be used to heating 3# high-pressure extraction heater under different load condition, or the feedwater through oxygen-eliminating device and feed pump 13 exit, the extracted steam from turbine of exclusion elevated pressures grade, effective cascade utilization fume afterheat, main steam flow and specific fuel consumption substantially constant time, increase steam turbine output work to greatest extent, improve power plant efficiency.
In the air passageway, corrode to prevent flue gas low-temperature, forward type air preheater 6 is arranged before conventional swinging air device, recommend to adopt heat pipe-type or shell-and-tube air preheater, normal temperature air is after preposition regenerative air heater 6 is preheating to uniform temperature, series connection is sent into low temperature rotary air preheater 4, in high temperature rotating regenerative air heater 2, is continued heating, until reach the temperature required for boiler hot air.
The invention has the beneficial effects as follows the design by flue gas progressive solution air cleverly, fume afterheat can be made to heat the high-pressure feed water of heat regenerative system, and form a set of waste heat deep exploitation system flexibly by valve regulated flue gas feed-water heater inlet water.Native system can change according to unit load, realize flue gas feed-water heater between 2# and 3# high-pressure extraction heater, and the series connection between 3# high-pressure extraction heater and oxygen-eliminating device, exclusion 2# or 3# high-pressure heater regenerative steam, when main steam flow is constant, increase steam turbine power output to greatest extent, improve power plant efficiency, reduce unit coal consumption.
Accompanying drawing explanation
Fig. 1 is a kind of coal-fired power station boiler fume afterheat deep exploitation system schematic for heating high-pressure feedwater
Detailed description of the invention
The invention provides and propose a kind of flue gas in power station boiler waste heat deep exploitation system for heating high-pressure feedwater.Be explained below in conjunction with accompanying drawing and example.
Figure 1 shows that the coal-fired power station boiler fume afterheat deep exploitation system schematic for heating high-pressure feedwater.In figure, system is made up of three grades of flue gas air heating systems and flue gas feed-water heater; The smoke discharging pipe of boiler 1 is in series with high temperature rotating regenerative air heater 2, flue gas feed-water heater 3, low temperature rotary air preheater 4, deduster 5, forward type air preheater 6 and air-introduced machine 7 successively; Steam turbine high-pressure cylinder 8, Steam Turbine Through IP Admission 9 and turbine low pressure cylinder 10 and generator 11 are connected in series.The regenerative steam of turbine low pressure cylinder 10 and steam discharge enter condenser and low pressure back heating system 12, add the condensate water in heat low heat regenerative system, the regenerative steam of steam turbine high-pressure cylinder 8 and Steam Turbine Through IP Admission 9 heats the feedwater in the high-pressure extraction system be made up of 1# high-pressure heater, 2# high-pressure heater, 3# high-pressure heater.The feedwater of this heating returns steam turbine high-pressure cylinder 8 through 1# high-pressure heater again; 2#, 3# high-pressure extraction heater is connected in series by valve 14 and flue gas feed-water heater 3.
Native system utilizes fume afterheat progressive solution air and high-pressure extraction feedwater, and its principle is as follows, the flue gas of 300-400 DEG C of boiler 1 afterbody is through high temperature rotating regenerative air heater 2, enter flue gas feed-water heater 3, enter low temperature rotary air preheater 4 again, then pass in and out forward type air preheater 6 through deduster 5, its smoke evacuation enters desulfurizer through air-introduced machine 7, the forward type air preheater 6 arranged and low temperature rotary air preheater 4 make high temperature rotating regenerative air heater 2 entering air temperature raise, delivery temperature also increases, high temperature rotating regenerative air heater 2 delivery temperature controls between 220-280 DEG C, guarantee that exhaust gas heat can be used for heating 3# high-pressure extraction heater under different load condition, or the feedwater through oxygen-eliminating device and feed pump 13 exit, the extracted steam from turbine of exclusion elevated pressures grade, effective cascade utilization fume afterheat, main steam flow and specific fuel consumption substantially constant time, increase steam turbine output work to greatest extent, improve power plant efficiency.
In the air passageway, corrode to prevent flue gas low-temperature, forward type air preheater 6 is arranged before conventional rotary regenerative air heater, recommend to adopt heat pipe-type or shell-and-tube air preheater, normal temperature air is after preposition regenerative air heater 6 is preheating to uniform temperature, series connection is sent into low temperature rotary air preheater 4, in high temperature rotating regenerative air heater 2, is continued heating, until reach the temperature required for boiler hot air.
Claims (4)
1., for a coal-fired power station boiler fume afterheat deep exploitation system for heating high-pressure feedwater, it is characterized in that, this system is made up of three grades of flue gas air heating systems and flue gas feed-water heater; The smoke discharging pipe of boiler (1) is in series with high temperature rotating regenerative air heater (2), flue gas feed-water heater (3), low temperature rotary air preheater (4), deduster (5), forward type air preheater (6) and air-introduced machine (7) successively; Steam turbine high-pressure cylinder (8), Steam Turbine Through IP Admission (9) and turbine low pressure cylinder (10) and generator (11) are connected in series, and wherein high temperature rotating regenerative air heater (2), low temperature rotary air preheater (4) and forward type air preheater (6) are three grades of flue gas air heating systems; The regenerative steam of described steam turbine high-pressure cylinder (8) and Steam Turbine Through IP Admission (9) heats the feedwater in the high-pressure extraction system be made up of 1# high-pressure extraction heater, 2# high-pressure extraction heater and 3# high-pressure extraction heater, and the feedwater of this heating returns steam turbine high-pressure cylinder (8) through 1# high-pressure extraction heater again; The regenerative steam of described turbine low pressure cylinder (10) and steam discharge enter condenser and condensate water low-pressure heating system (12), the condensate water in heat-setting water low-pressure heating system (12); Turbine low pressure cylinder (10) delivers to oxygen-eliminating device and feed pump (13) by condensate water low-pressure heating system (12) condensate water, is sent to 3# high-pressure extraction heater, 2# high-pressure extraction heater, 1# high-pressure extraction heater successively through oxygen-eliminating device and feed pump (13) feedwater; 2# high-pressure extraction heater or 3# high-pressure extraction heater to be in series with flue gas feed-water heater (3) by valve and to connect; The regenerative steam of described steam turbine high-pressure cylinder (8) and Steam Turbine Through IP Admission (9) heats the feedwater in the high-pressure extraction system be made up of 1# high-pressure extraction heater, 2# high-pressure extraction heater and 3# high-pressure extraction heater.
2. a kind of coal-fired power station boiler fume afterheat deep exploitation system for heating high-pressure feedwater according to claim 1, it is characterized in that, described flue gas feed-water heater (3) had not only been arranged in parallel with 2# high-pressure extraction heater by the combination of corresponding pipeline and valve, but also to be arranged in parallel with 3# high-pressure extraction heater; And pass through the combination of booster pump (14) and corresponding pipeline and valve, then can be connected on and can be connected between 3# high-pressure extraction heater-oxygen-eliminating device between 2#-3# high-pressure extraction heater, again.
3. a kind of coal-fired power station boiler fume afterheat deep exploitation system for heating high-pressure feedwater according to claim 1, it is characterized in that, in fume side, the flue gas of 300-400 DEG C of boiler (1) afterbody is through high temperature rotating regenerative air heater (2), enter flue gas feed-water heater (3), enter low temperature rotary air preheater (4) again, then enter forward type air preheater (6) through deduster (5), its smoke evacuation enters desulfurizer through air-introduced machine (7).
4. the fume afterheat deep exploitation method of a kind of coal-fired power station boiler fume afterheat deep exploitation system for heating high-pressure feedwater described in claim 1, it is characterized in that, the forward type air preheater (6) arranged and low temperature rotary air preheater (4) make high temperature rotating regenerative air heater (2) entering air temperature raise, delivery temperature also increases, high temperature rotating regenerative air heater (2) delivery temperature controls between 220-280 DEG C, guarantee that exhaust gas heat can be used for heating 3# high-pressure extraction heater under different load condition, or the feedwater through oxygen-eliminating device and feed pump (13) exit, the extracted steam from turbine of exclusion different pressures grade, main steam flow and specific fuel consumption substantially constant time, increase steam turbine output work to greatest extent, by flue gas under different load, feedwater characteristic at different temperatures, select optimum heater connection scheme, reach best waste heat recovery state, improve power plant efficiency, normal temperature air is after preposition regenerative air heater (6) is preheating to uniform temperature, low temperature rotary air preheater (4) is sent in series connection, heating is continued again, until reach the temperature required for boiler hot air in high temperature rotating regenerative air heater (2).
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| CN201210216449.2A CN102767821B (en) | 2012-06-27 | 2012-06-27 | Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure |
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| CN201210216449.2A CN102767821B (en) | 2012-06-27 | 2012-06-27 | Smoke waste heat deep utilization system of power station boiler for heating supplied water at high pressure |
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| CN102767821A CN102767821A (en) | 2012-11-07 |
| CN102767821B true CN102767821B (en) | 2015-04-15 |
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| CN103062754B (en) * | 2012-12-28 | 2014-08-20 | 华北电力大学 | Power station machine furnace integrated cold end comprehensive optimization system |
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| CN103104907B (en) * | 2013-01-31 | 2015-04-15 | 华北电力大学 | Heating structure and heating method of boiler based on partitioned flue and multistage air preheating |
| CN103411203B (en) * | 2013-05-24 | 2015-03-04 | 山东英电节能科技有限公司 | Method and device for carrying out gradient utilization on boiler flue gas waste heat to improve efficiency of thermal power unit |
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| CN103438426B (en) * | 2013-07-26 | 2015-04-08 | 山东英电节能科技有限公司 | Boiler smoke gas afterheat energy-saving system for thermal power plant |
| CN103375792A (en) * | 2013-08-05 | 2013-10-30 | 华北电力大学 | Engine-boiler coupled deep waste heat utilization system for air cooling unit |
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| CN108105784B (en) * | 2018-01-23 | 2023-08-18 | 天津城建大学 | Low-temperature waste heat recovery system and method for waste incineration power plant |
| CN109578968B (en) * | 2018-12-18 | 2023-10-20 | 华北电力大学 | Coal-fired power generation system with sectional coupling of coal-fired boiler and garbage incinerator |
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